Carbureter.



ALEXANJSERWINTON, or CLEVELAND, OHIO.

CARBVRETER.

Specification of Letters Patent.

Patented Dec. 12, 1911.

Application filed May 12, 1911. Serial No. 626,795.

To all 'w/w'm it may concern:

Be it known that I, ALEXANDER lVIX'rON, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio. have invented certain newt and useful 1m provements in Carburetors, of

which the following is aspecitication, reference being had therein tothe accompanying drawing.

This in vention relates to improvements in carburetors, and is especially designed and intended for use with marine internal coinbustion engines.

-The object of the present invention is to provide a carbureter with a main carbureting passage for supplying the explosive mixture to the motor when running under load and power, and an auxiliary carbureting' passage for starting the motor and running it slow, and to provide an improved construction and arrangement of parts for controlling the passage of the air through these carbureting chambers and to maintain the desired vacuum in the main carbureting passage at the main gasolene inletftherei or.

In the accon'ipatrying drawingl igure 1 is a perspective view ot' my improved carbureter. .l ig. 2 a side elevation thereof, partly in section. Fig. -3 is a horizontal sectional view' on the line 3 of Fig. 2.

in carrying out my present invention, a main earlnireting passage and an auxiliary ct'irbttrcting passage are provided, the main carburetinppassage containing three (le pendent or opta'at'ively connected throttles relatively adjustable; a main gasolene sup ply valve in the main passage and operatively connected with the throttles, and a gasolenc supply valve or opening the mixiliary carbureting passage independent of the said throttles.

Referring now to the drawings, 1. is the :arbureter casting, which stands in a vertical position and through which passes a main carbureting chamber 2. Located at one side of the casting 1, a rasolene sup ply chamber 3. containing a Heat 4, operatively connected in any well-known manner with.the valve 5, which maintains the gasolcne within the chamber 3 at a predetermined level, all of which is so well understood by those skilled in this art. that further lllllSll'tlllUll or explanation is un necessary. A conduit or passage (5 connects the lower end of the chamber 3 with a vertical passage 7 and this vertical passage 7 communicates with a. main gasolene supply nipple 8, which projects into the main carbureting chamber 2.

Located parallel with the casting l and carbureting chamber 2 is an auxiliary carburetingr passage 9 formed in a suitable tube or casting 10. The lower end 11 of this auxiliary passage 9 communicates with the lower end of the chamber 2, and the upper end 12 of this auxiliary carbureting passage communicates with the upper'portion of the main earbnreting chamber 2. lateral passage 13 communicates throi' 'hfa suitable valve nipple 14, with the an. iary carbureting passage 9 and through 'which-gasolene passes and is controlled by a suitable adjustable needle 'valve 15. i

A needle valve '16 controls the flow of gasolene through the nipple 8 into the main carbureting chamber 2, and this valve 16 is normally held to its seatby a suitable spring 17.

Located within 'the main carburetlng chamber 2, is an upper throttle 18, located just above the upper end 12 of the auxiliary passage 9, and also located in this main carbureting chamber 2 is an intermediately positioned throttle 19, located between the opening 12 and the gasolcne supply nipple 8. A lower throttle 20 is also placed in the main earbureting chamber 2 and is located between the lower end 11. of the auxiliary carbureting passage 9 and the gasolene supply nipple 8, all of which is illustrated in Fig. 2. A throttle lever 21 is connected with the upper throttle 18; a throttle lever 22 is connected with the intermediate throttle 19, and a throttle lever 23 is operatively connected with the lower throttle 20. A link or rod 24- has its upper end loosel y passing through the free end of the throttle lever 21 so that the .iree'end of'the throttle lever may have a vertical.movement on the upper end of said link independently of the link. The lower end of this link .24 is pivotally connected at the point. 25 with the upper end of a link 20 and the free end of the tl'irottle lever 22 is pivotally connected with the link 26 just. below the lower end of the link 24. A link 28 has its lower end pivotally connected with the free end of the throttle lever 23 at the point. 29. The inner ends oi? these links 26 and 28 are provided respectively with right and left hand screwt-hreads which enter and engage corresponding screw-threads formed in opposite ends,

' vided with a suitable ball or other detent a knurled head 33 by means ofwhich it is adjusted position.

'ment of the lever 50 and by these screws of a rotatable tubular portion One end I of this tubular portion 32 is provided with l rotated in either direction for the purpose of either drawing the adjacent ends of the links 26 and 28 nearer together, or forcing them apart for a purpose to be explained hereinafter; The knurled head 33 is pro- 34 to engage longitudinal grooves 35 in the link 26 to hold the tubular portion 32 at its The lower portion of the link 24v is screwthreaded at 35 and receives an adjustable knurled thumb screw 36by means of which the amount of independent downward movementof the free end of the throttle lever 21 in respect to the link is adjusted for a purpose to be explained hereinafter. A suit able contracting spring 37 has its lower end connected with the throttle lever 23 and its upper end connected with the-casting 1, by means of which the throttle levers 22 and 28am normally held in their uppermost positions. 1

The needle valve 16 has" its stem 38 projecting outside of the casting land passes through the cam lever 39 and engages an adjustable thumbescrew 47 on the valve stem. The lower end of this cam lever 39 is pivoted at the point 43 to an arm 44 projecting outward from the casting 1, while its upper end 45 is engaged by a cam 16 operatively connected with the intermediate throttle 19. The adjustable thumb-screw 47 engages a screw-threaded portion 48 on the valve stem 38, by means of which the amount of movement of the valve stem by the cam 46 is adjustable.

The, operating lever 50 is connected with the upper throttle 18 and an operating connection 51 is connected with the free end of this lever 50 for operating the throttles in a manner to be explained presently. This lever 50 carries'at opposite sides arms 52 and 53, and passing through these arms are screws 54 and 55. These screws 54 and are adapted to engage a lug 56 on the casting 1. The screw 54 by adjustment will limit the closing movement of the lever 50, and the screw 55 limits the opening move these two movements are adjustable. The operation of this carburetor is as follows: The screw 36 is set to hold the upper throttle 18 in its desired position, which would be slightly open. The screw 36 being adjusted to permit the desired independent movement or" the throttle lever 21 on the link 24, the throttles 19 and 20, remain closed, while the throttle 18 is open the distance permitted by the independent movement of the lever 21 on-the link 24. During this period of time, the explosive mixture is supplied to the motor wholly through the ued opening of the throttle 18 carries the throttle lever 21 in engagement with the screw 36 and forces the links 25, 26 and 28 downward carrying with them the throttle levers 22 and 23, and opening the throttles 19 and 20 in the main carbureting chamber the desired distance according to the desired speed or power of the motor. The opening movement of the throttle 19 carries with it the cam 16, which operating on the cam lever 45 forces it outward and it in turn unseats the needle valve 16 in the main carbureting chamber 2 and the motor is then supplied with the mixture principally "pour the main carbureling chamben-EZ, and the amount of gasolene supplied is increased or decreased automatically by the cam and cam lever according to the distance the throttles 19 and 20 are opened.

By means of the screw threaded tubular portion 32, the relative positions of the throttles 19 and 20 may be regulated for the purpose of maintaining the desired vacuum at the nozzle of thenipple 8; which opens as before stated with the movement of the lower throttles and with the movement of the upper throttle after it has traveled its independent movement on the link 24.

' Having thus described my invention, what I claim and desire to secure by, Letters Pat- 1. In a carbureter, the combination of a main carbureting chamber, an auxiliary carbureting'passage having its two ends communicating with the ends of the main carbureting chamber, a gasolcne supply for the auxiliary passage, a gasolene supply located in the main carburcting chamber at a point between the ends of said auxiliary carbureting passage, and throttles in the main carbureting chamber controlling the passage of the mixture through the main carbureting chamber and the auxiliary carbureting passage.

2. In a carbureter, the combination of a main carbureting chamber, an auxiliary carbursting passage having its two ends communicating with the ends of the main carbureting chamber, a gasolene supply for the auxiliary passage, a gasolene supply located in the main carbureting chamber at a point between the two ends of said auxiliary carburcting passage, a throttle located in the main carbureting chamber between the ends of the auxiliary carbureting passageto control the passage of air throughthe main carbureting chamber, and a throttle located in the main carbureting chamber beyond the 

